Well, last weekend I took about 40 rounds loaded up with Lee 230 grain Truncated Cone bullets. These have the advantage in that there is no shoulder around the base of the bullet nose - the cone goes right up to the maximum diameter of the bullet.

I figured this would eliminate the "step" from the base of the bullet nose to the outside edge of the brass, which was measuring about .027" with the Lee RN bullets.

I looked at your previous posts and you have been at this for a while.

In one post you said your P90 works fine with factory ammunition and one brand of aftermarket lead bullets.

Some have suggested magazine issues. Others have given you sizing and depth advice.

I don’t have these issues with any of the commercial cast LRN or LRN (truncated cone) 230’s I have used in my M1911’s

I taper crimp my 45 ACP with an RCBS taper crimp die, and I taper crimp to 0.469”. I am not certain that a Lee taper crimp die really puts on a taper crimp, or is some sort of a taper crimp. The mouth of my cases is close to flush against the bullet. No particular edge for anything to catch.

Don't worry about "headspacing" on the mouth of the case. While headspace may be measured that way, my M1911's work fine with my reloads which have nothing in particular to headspace up front. I think I get good ignition due to the rim being held by the extractor.

Your pistol should not be having these issues. I am of the opinion that what you have is a mechanical issue. Something is out of tolerance in your pistol. It may be as simple as the magazine seating too high inside the pistol. Maybe some M1911 smiths can chime in on this, but I don’t think the extracted rim should be rubbing against the next cartridge coming off the stack. It is likely that small differences in the diameters of factory ammunition and your bullets is enough to cause a failure to extract.

If you are using the Lee 230TC (not TL), sized .452, I seat mine at 1.185" OAL and have 100% function in several different 1911's and other 45's. Try different mags or have your local gunsmith look at the gun. Cartridges moving toward the front of the mag is not unusual and should not be a problem.

Perhaps your magazine is causing the problem. The top round too high in the magazine so the extracted case hits th bullet of the top round? My P90 has fed everything I've put in the magazines, but I don't have any TC rounds loaded up; I'll have to try them in my P90...

After looking at some more of your pics, how does the extractor look? Could there be grunge under the extractor so that it doesn't get a good grip on the rim? Or perhape not enough spring tension? Just some thoughts, 'cause my Ruger has been almost flawless.

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Take a caliper to a sampling of your bullets: two measurements of the diameter,taken at 90deg offset from one another. Let us know the dimensions. They should be .452" consistently.
Measure the case mouth width at the highest point, on a crimped,loaded round. Let us know the dimension. It should be .471-.472,IIRC.

That might help us diagnose the "bullet vs load vs gun" question.

I've run the Lee 230grTC (TL version) through a P90, G30 and a 1911 so far. The 1911 was by far the most forgiving, but my issues in the other two were mostly bullet related, and were eventually solved.

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